When a block of 8 kg is pushed horizontally with a force of 100N horizontally, it accelerates at a rate of 3m/s?
a) What is the weight of the block?
b) What is the magnitude of the normal force acting on the block?
c) What is the magnitude of the friction force?
d) Is the friction force kinetic or static?
e) What is the coefficient of (kinetic or static depending on your answer from (d)) friction
between the box and the floor?

c. newton's third law of motion

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.